#列表加法&乘法
list_1 = [10, 20, 30]
list_2 = [5, 6, 7]
print(list_1 + list_2)            # [10, 20, 30, 5, 6, 7]
print(list_1 * list_2[0])         # [10, 20, 30, 10, 20, 30, 10, 20, 30, 10, 20, 30, 10, 20, 30]

# s5 = s6
s5 = "我爱你" * 5
s6 = "我爱你我爱你我爱你我爱你我爱你"